Resonant circuit and method for detecting a fault thereof

Abstract

The application discloses a resonant loop and a fault detection method thereof. The resonant loop comprises a driving module, a driving loop switch module, a synchronous detection module, a switching transistor, a resonant heating module and a control module. The control module is used for sending a control signal; the driving module or the driving loop switch module is used for sending a driving signal to drive the switching transistor to be in a conduction state according to the control signal; the synchronous detection module is used for detecting a resonant signal generated by the resonant loop and sending a synchronous signal; and the control module is further used for judging whether the resonant loop has a fault according to whether the synchronous signal is sent. In this way, the application can control the driving module or the driving loop switch module to send a driving signal to drive the switching transistor to be in a conduction state through the control module, and judge whether the resonant loop has a fault according to the synchronous signal sent by the synchronous detection module when detecting the resonant signal, so that the fault detection of the resonant loop is realized.

Description

Technical Field

[0001] This invention relates to the field of circuit fault detection technology, and in particular to a resonant circuit and its fault detection method. Background Technology

[0002] Currently, multi-coil induction cooktops require a single chip to simultaneously drive and control multiple resonant circuits. Each circuit needs precise timing and control signals to ensure its normal operation, and the programmable pulse generator (PPG) driver for each resonant circuit requires an independent timer to ensure precise timing control. Because multiple resonant circuits need to be driven simultaneously, the chip requires a large number of input / output ports to output control signals and receive detection signals. Conventional chips often have few PPG output ports, which cannot meet the needs of multi-coil induction cooktops; while high-specification chips, although powerful, are more expensive. To overcome the port shortage problem, a method of switching selection and detection signal merging is adopted. By adding a new switching circuit at the detection signal module of each resonant circuit, a limited number of input / output ports can be time-division multiplexed to drive different resonant circuits, thereby reducing the demand for input / output ports.

[0003] Because of the introduction of switching circuits to multiplex ports, these switching circuits themselves can become potential points of failure. Switches may fail due to overload, aging, or short circuits. The stability of the drive circuit also directly affects the efficiency and safety of the induction cooker. If a resonant circuit malfunctions, it may lead to a decrease in the performance of the entire system or even damage. Therefore, due to the addition of switching circuits, fault detection of the resonant circuits is essential. Summary of the Invention

[0004] In view of this, the present invention aims to at least partially solve one of the problems in the related art. Therefore, the object of the present invention is to provide a resonant circuit and a fault detection method thereof.

[0005] This application provides a resonant circuit. The resonant circuit includes a driving module, a driving circuit switching module, a synchronization detection module, a switching transistor, a resonant heating module, and a control module. The resonant heating module includes a coil inductor and a resonant capacitor. The driving module is connected to the driving circuit switching module; the switching transistor is connected to both the driving circuit switching module and the resonant heating module; the synchronization detection module is connected in parallel with the resonant heating module; the control module is connected to both the driving module and the driving circuit switching module; the control module is used to issue a control signal; the driving module or the driving circuit switching module is used to issue a driving signal according to the control signal to drive the switching transistor to a conducting state; the synchronization detection module is used to detect the resonant signal generated by the resonant circuit and issue a synchronization signal; the control module is also used to determine whether the resonant circuit has malfunctioned based on the synchronization signal.

[0006] This application provides a fault detection method applied to the resonant circuit described in the above embodiments. The fault detection method includes: controlling the driving module to emit a first driving signal or the driving circuit switching module to emit a second driving signal, wherein the first driving signal is a signal that drives the switching transistor to be in a conducting state, and the second driving signal is a signal that drives the switching transistor to be in a conducting state; controlling the synchronization detection module to perform a first fault detection on whether the resonant circuit generates a resonant signal; if the synchronization detection module detects the resonant signal, the synchronization detection module emits a synchronization signal to determine that the resonant circuit has failed based on the synchronization signal.

[0007] In some embodiments, after the synchronization detection module performs a first fault detection to check whether the resonant circuit generates a resonant signal, the fault detection method further includes: if the synchronization detection module does not detect the resonant signal, controlling the synchronization detection module not to issue the synchronization signal; controlling the drive module to issue a first drive signal and the drive circuit switching module to issue a second drive signal, while simultaneously driving the switching transistor to be in an on state; controlling the synchronization detection module to perform a second fault detection to check whether the resonant circuit generates a resonant signal.

[0008] If the synchronization detection module does not detect the resonant signal, then the synchronization detection module will not issue the synchronization signal and will determine that the resonant circuit has failed.

[0009] In some embodiments, after the synchronization detection module performs a second fault detection on whether the resonant circuit generates a resonant signal, the fault detection method further includes: if the synchronization detection module detects the resonant signal, the synchronization detection module issues a synchronization signal to determine that the resonant circuit is fault-free.

[0010] In some embodiments, controlling the driving module to issue a first driving signal to drive the switching transistor into a conducting state includes: controlling the pulse input port of the driving module to input a low-level signal of a first duration, and controlling the driving circuit switch port of the driving circuit switch module to input a high-level signal of a first duration, so that the driving module issues the first driving signal; controlling the synchronization detection module to perform a first fault detection on whether the resonant circuit generates a resonant signal includes: controlling the pulse input port of the driving module to switch from the low-level signal to the input of a high-level signal of a second duration, and controlling the driving circuit switch port of the driving circuit switch module to input a high-level signal of a second duration, so as to control the synchronization detection module to perform a first fault detection on the resonant circuit.

[0011] In some embodiments, controlling the drive circuit switching module to issue a second drive signal to drive the switching transistor into a conducting state includes: controlling the pulse input port of the drive module to input a high-level signal of a third duration, and controlling the drive circuit switching port of the drive circuit switching module to input a low-level signal of a third duration, so that the drive circuit switching module issues the second drive signal; controlling the synchronization detection module to perform a first fault detection on whether the resonant circuit generates a resonant signal includes: controlling the pulse input port of the drive module to input a high-level signal of a fourth duration, and controlling the drive circuit switching port of the drive circuit switching module to input a low-level signal of a fourth duration, so as to control the synchronization detection module to perform a first fault detection on the resonant circuit.

[0012] In some embodiments, controlling the drive module to issue a first drive signal and the drive circuit switch module to issue a second drive signal, while simultaneously driving the switch transistor to be in an on state, includes: controlling the pulse input port of the drive module to input a low-level signal of a fifth duration, and controlling the drive circuit switch port of the drive circuit switch module to input a low-level signal of a fifth duration, so that the drive module issues the first drive signal and the drive circuit switch module issues the second drive signal; controlling the synchronization detection module to perform a second fault detection on whether the resonant circuit generates a resonant signal includes: controlling the pulse input port of the drive module to switch from inputting the low-level signal to inputting a high-level signal of a sixth duration, and controlling the drive circuit switch port of the drive circuit switch module to input a low-level signal of a sixth duration, so as to control the synchronization detection module to perform a second fault detection on the resonant circuit.

[0013] In some implementations, the duration of the first fault detection and the duration of the second fault detection are greater than or equal to 5 microseconds.

[0014] In some embodiments, the resonant circuit includes a plurality of driving modules and a plurality of driving circuit switching modules corresponding to the driving modules. The driving module includes a pulse output port, and the driving circuit switching module includes a driving circuit switching port. Each driving circuit switching port drives and controls the corresponding switching transistor to be in an on or off state. Controlling the driving module to issue a first driving signal or the driving circuit switching module to issue a second driving signal to drive the switching transistor to be in an on state includes: controlling the plurality of pulse output ports to issue a first driving signal or the plurality of driving circuit switching ports corresponding to the pulse output ports to issue a second driving signal to drive the switching transistor to be in an on state.

[0015] In some embodiments, controlling the drive module to issue a first drive signal and the drive circuit switch module to issue a second drive signal, while simultaneously driving the switch transistor to be in a conducting state, includes: controlling a plurality of pulse output ports to issue a first drive signal and a plurality of drive circuit switch ports corresponding to the pulse output ports to issue a second drive signal, while simultaneously driving the switch transistor to be in a conducting state.

[0016] Thus, this application can control the drive module or drive circuit switch module to send a drive signal to drive the switch transistor to the on state through the control module, and determine whether the resonant circuit has a fault based on the synchronization signal sent when the synchronization detection module detects the resonant signal, thereby realizing the fault detection of the resonant circuit.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0019] Figure 1 This is one of the structural schematic diagrams of the resonant circuit according to an embodiment of this application;

[0020] Figure 2 This is one of the flowcharts illustrating the fault detection method for the resonant circuit according to an embodiment of this application;

[0021] Figure 3 This is a second schematic diagram of the resonant circuit according to an embodiment of this application;

[0022] Figure 4 This is a flowchart illustrating the fault detection method for a resonant circuit according to an embodiment of this application.

[0023] Figure 5This is a time signal schematic diagram of the fault detection method for the resonant circuit according to the embodiments of this application;

[0024] Figure 6 This is a second schematic flowchart of the fault detection method for the resonant circuit according to the embodiments of this application;

[0025] Figure 7 This is the third flowchart illustrating the fault detection method for the resonant circuit according to the embodiments of this application;

[0026] Figure 8 This is the fourth flowchart of the fault detection method for the resonant circuit according to the embodiments of this application.

[0027] Main component reference numerals:

[0028] Resonant circuit 100;

[0029] Drive module 10, first drive module 11, second drive module 12, third drive module 13, fourth drive module 14; drive circuit switch module 20, first drive circuit switch module 21, second drive circuit switch module 22, third drive circuit switch module 23, fourth drive circuit switch module 24; synchronization detection module 30, first synchronization detection module 31, second synchronization detection module 32, third synchronization detection module 33, fourth synchronization detection module 34; switching transistor 40, first switching transistor 41, second switching transistor 42, third switching transistor 43, fourth switching transistor 44; resonant heating module 50, control module 60. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly, referring to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or connections capable of communication; direct connections or indirect connections via an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances.

[0033] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0035] Please see Figure 1 and Figure 2 The resonant circuit 100 includes a drive module 10, a drive circuit switch module 20, a synchronization detection module 30, a switching transistor 40, a resonant heating module 50, and a control module 60. The resonant heating module 50 includes a coil inductance L and a resonant capacitor C. The drive module 10 is connected to the drive circuit switch module 20; the switching transistor 40 is connected to both the drive circuit switch module 20 and the resonant heating module 50. The synchronization detection module 30 is connected in parallel with the resonant heating module 50. The control module 60 is connected to both the drive module 10 and the drive circuit switch module 20. The control module 60 is used to issue control signals. The drive module 10 or the drive circuit switch module 20 is used to issue drive signals based on the control signals to drive the switching transistor 40 into a conducting state. The synchronization detection module 30 is used to detect the resonant signal generated by the resonant circuit 100 and issue a synchronization signal. The control module 60 is used to determine whether a fault has occurred in the resonant circuit 100 based on the synchronization signal.

[0036] The control signal issued by the control module 60 can be a voltage signal or a current signal, and there is no restriction on it.

[0037] Thus, this application can control the drive module 10 or the drive circuit switch module 20 to send a drive signal to drive the switch transistor 40 to be in the on state through the control module 60, and determine whether the resonant circuit 100 has a fault based on the synchronization signal sent by the synchronization detection module 30 when detecting the resonant signal, thereby realizing the fault detection of the resonant circuit 100.

[0038] Specifically, please refer to Figure 3 This application discloses a fault detection method for a resonant circuit 100. The fault detection method includes:

[0039] 01: The control drive module 10 sends a first drive signal or the drive circuit switch module 20 sends a second drive signal. The first drive signal is the signal that the drive switch transistor 40 is in the on state, and the second drive signal is the signal that the drive switch transistor is in the on state.

[0040] 02: The control synchronization detection module 30 performs the first fault detection on whether the resonant circuit 100 generates a resonant signal;

[0041] 03: If the synchronization detection module 30 detects a resonant signal, the synchronization detection module 30 will send a synchronization signal to determine whether the resonant circuit 100 has failed based on the synchronization signal.

[0042] Please see Figure 1 The resonant circuit 100 provided in this application includes a control module 60, which is connected to the drive module 10, the drive circuit switch module 20 and the synchronization detection module 30 respectively.

[0043] In other words, steps 01, 02, and 03 can be implemented by the control module 60. The control module 60 is used to: control the drive module 10 to issue a first drive signal or the drive circuit switch module 20 to issue a second drive signal; and control the synchronization detection module 30 to perform a first fault detection on whether the resonant circuit 100 generates a resonant signal. If the synchronization detection module 30 detects a resonant signal, it issues a synchronization signal to determine whether the resonant circuit 100 has failed.

[0044] Specifically, controlling the drive module 10 to issue a first drive signal or the drive circuit switch module 20 to issue a second drive signal includes two schemes. The first scheme involves the drive module 10 issuing a first drive signal via its pulse input port, controlling the synchronization detection module 30 to perform a first fault detection. The second scheme involves the drive circuit switch module 20 issuing a second drive signal via its drive circuit switch port, controlling the synchronization detection module 30 to perform a first fault detection. The principle of the first fault detection is that a resonant signal will only be generated when the drive module 10 issues a first drive signal and the drive circuit switch module 20 issues a second drive signal simultaneously. Neither of these two schemes will generate a resonant signal. If a resonant signal is detected, it indicates that the resonant circuit 100 has malfunctioned.

[0045] First, the control drive module 10 sends out a first drive signal. For example, the control module 60 can input a low-level signal to the port PPG1_0 of the drive module 10, so that the pulse input port of the drive module 10 sends out the first drive signal.

[0046] The first driving signal is an electrical signal sent to the switching transistor 40 to drive the switching transistor 40 to conduct. It can be a voltage signal or a current signal.

[0047] For details, please refer to Figure 2 When the control module 60 inputs a high-level signal to port PPG1_0 of the drive module 10, the drive module 10 does not issue the first drive signal. Controlling the drive circuit switch module 20 to issue the second drive signal can be achieved by the control module 60 inputting a low-level signal to port PPG1_SW1 of the drive circuit switch module 20, causing the drive circuit switch port of the drive circuit switch module 20 to issue the second drive signal. The second drive signal is an electrical signal sent to the switching transistor 40 to turn on the switch transistor 40; it can be a voltage signal or a current signal. When the control module 60 inputs a high-level signal to port PPG1_SW1 of the drive circuit switch module 20, the drive circuit switch module 20 does not issue the second drive signal.

[0048] Secondly, the control synchronization detection module 30 performs a first fault detection on whether the resonant circuit 100 generates a resonant signal. If the synchronization detection module 30 detects a resonant signal, it sends a synchronization signal, and the control module 60 determines that the resonant circuit 100 has failed based on the synchronization signal.

[0049] For example, the specific detection process of whether the resonant circuit 100 generates a resonant signal by the synchronization detection module 30 can be as follows: the control module 60 inputs a low-level signal to the port PPG1_SW1 of the synchronization detection selection switch, turning on the synchronization detection selection switch. The synchronization detection selection switch is connected to the synchronization detection module 30. When the synchronization detection selection switch is on, the synchronization detection module 30 starts the first fault detection. When the control module 60 inputs a high-level signal to the port PPG1_SW1 of the synchronization detection selection switch, the synchronization detection selection switch is turned off, and the synchronization detection module 30 does not work.

[0050] The switching transistor 40 can be an Insulated Gate Bipolar Transistor (IGBT). Please refer to [link / reference needed]. Figure 1 The switching transistor 40 is connected in series with the drive module 10 and the drive circuit switching module 20. The switching transistor 40 can only be turned on and function normally when the control module 60 simultaneously controls the drive module 10 to issue a first drive signal and the drive circuit switching module 20 to issue a second drive signal. In other cases, such as when the drive module 10 issues the first drive signal but the second drive signal is not issued by default, or when the drive circuit switching module 20 issues the second drive signal (but the first drive signal is not issued by default), the switching transistor 40 is turned off. Thus, the control module 60 controls the on / off state of the switching transistor 40 by controlling the drive module 10 or the drive circuit switching module 20.

[0051] Please see Figure 2 The coil inductance L and the resonant capacitor C form the core of the resonant circuit 100. The coil inductance L and the resonant capacitor C can be connected in series or in parallel and then connected to the switching transistor 40. When the switching transistor 40 is turned on, the coil inductance is charged, generating a resonant signal.

[0052] The synchronous detection module 30 has a voltage comparator inside, which is connected to both ends of the coil inductor. It compares the voltage across the coil inductor. If the resonant circuit 100 generates a resonant signal that causes the voltage across the coil inductor to change and the synchronous detection selection switch is turned on, the synchronous detection module 30 will start detection and can detect the resonant signal.

[0053] Understandably, the control module 60 controls the drive module 10 to send a first drive signal or the drive circuit switch module 20 to send a second drive signal, preventing the switch transistor 40 from conducting. As a result, the coil inductor is not working and no resonant signal is generated. Subsequently, the control module 60 inputs a low-level signal to the port PPG1_SW1 of the synchronization detection selector switch, controlling the synchronization detection module 30 to start detecting the resonant signal. Under normal operating conditions of the resonant circuit 100, the synchronization detection module 30 will not detect the resonant signal. If the synchronization detection module 30 detects the resonant signal at this time, it indicates a fault in the resonant circuit 100, and the synchronization detection module 30 sends a synchronization signal. This synchronization signal can be a current signal output by the synchronization detection module 30. The control module 60 determines that the resonant circuit 100 has failed based on the synchronization signal.

[0054] Please see Figure 4 In some embodiments, after step 03, the fault detection method further includes:

[0055] 04: If the synchronization detection module 30 does not detect the resonance signal, the synchronization detection module 30 will not send a synchronization signal, and the control drive module 10 will send a first drive signal and the drive circuit switch module 20 will send a second drive signal, and the drive switch transistor 40 will be in the on state.

[0056] 05: Control synchronization detection module 30 performs a second fault detection on whether the resonant circuit 100 generates a resonant signal;

[0057] 06: If the synchronization detection module 30 does not detect the resonance signal, then the synchronization detection module 30 will not send a synchronization signal, and it is determined that the resonance circuit 100 has failed.

[0058] Please combine Figure 1 Steps 04, 05, and 06 can be implemented by control module 60. Control module 60 is used for: if no resonant signal is detected during the first fault detection, the synchronization detection module 30 does not issue a synchronization signal, and controls the drive module 10 to issue a first drive signal and the drive circuit switch module 20 to issue a second drive signal, so that the switch transistor 40 is in the conducting state; controlling the synchronization detection module 30 to perform a second fault detection on whether the resonant circuit 100 generates a resonant signal; if no resonant signal is detected during the second fault detection, the synchronization detection module 30 does not issue a synchronization signal, and it is determined that the resonant circuit 100 has failed.

[0059] Specifically, the control module 60 controls the drive module 10 to send a first drive signal and the drive circuit switch module 20 to send a second drive signal, causing the drive switch transistor 40 to be in a conducting state, charging the inductor coil and generating a resonant signal. Then, the control module 60 controls the synchronous detection selection switch to be turned on, and the synchronous detection module 30 starts detection to perform a second fault detection on whether the resonant circuit 100 generates a resonant signal. In this way, the control module 60 controls multiple modules to cause the resonant circuit 100 to generate a resonant signal, and determines whether a fault has occurred in the resonant circuit 100 based on whether the synchronous detection module 30 can detect the resonant signal.

[0060] Please see Figure 4 In this embodiment, after step 06, the fault detection method further includes:

[0061] 07: If the synchronization detection module 30 detects a resonance signal, the synchronization detection module 30 will send a synchronization signal to determine that the resonance circuit 100 is fault-free.

[0062] Please combine Figure 1 Step 07 can be implemented by the control module 60. The control module 60 is used to: if the synchronization detection module 30 detects a resonant signal during the second fault detection, the synchronization detection module 30 sends a synchronization signal to determine that the resonant circuit 100 is fault-free.

[0063] Understandably, if the result of the second fault detection is that the synchronous detection module 30 detects a voltage change across the coil, it indicates that the resonant circuit 100 has indeed generated a resonant signal. This means that the steps of controlling the drive module 10 to send the first drive signal and the drive circuit switch module 20 to send the second drive signal to turn on the switching transistor 40 have been effectively executed, and the synchronous detection module 30's synchronous detection effect is effective. If the resonant circuit 100 is faulty, for example, if the switching transistor 40 cannot conduct normally, the synchronous detection module 30 will not be able to detect the resonant signal. In conclusion, it can be determined that the resonant circuit 100 is not faulty.

[0064] Please see Figure 5 and Figure 6 In some embodiments, step 01 includes:

[0065] 011: The pulse input port of the control drive module 10 receives a low-level signal of the first duration T1, and the drive circuit switch port of the control drive circuit switch module 20 receives a high-level signal of the first duration T1, so that the drive module 10 outputs a first drive signal.

[0066] 012: The pulse input port of the control drive module 10 inputs a high-level signal with a second duration T3, and the drive circuit switch port of the control drive circuit switch module 20 inputs a low-level signal with a second duration T3, so that the drive circuit switch module 20 outputs a second drive signal.

[0067] Please combine Figure 1 Steps 011 and 012 can be implemented by the control module 60. The control module 60 can be used to: input a low-level signal of a first duration T1 to the drive module 10 and input a high-level signal of a first duration T1 to the drive circuit switch module 20, so that the pulse input port of the drive module 10 emits a first drive signal; input a high-level signal of a second duration T3 to the drive module 10 and input a low-level signal of a second duration T3 to the drive circuit switch module 20, so that the drive circuit switch module 20 emits a second drive signal.

[0068] Specifically, in one embodiment, the control module 60 can control the input of a low-level signal to port PPG1_0 of the drive module 10 and input a high-level signal to port PPG1_SW1 of the drive loop switch module 20, so as to control the pulse input port of the drive module 10 to send a first drive signal to drive the switching transistor 40. The range of the first duration can be 0.5us ≤ T1 ≤ 25us, and the first duration can be, for example, 1us, 2us, 3us, 4us, 5us, 6us, 7us, 8us, 9us, or 10us, without limitation. If the duration is too short, it is insufficient for the control module 60 to apply control to the drive module 10 or the drive loop switch module 20 and for the switching transistor 40 to change its on / off state; if the duration is too long, it will affect the detection efficiency and the overall detection process. Therefore, it is more appropriate to select a first duration within the range of 0.5us ≤ T1 ≤ 25us.

[0069] Subsequently, the control module 60 inputs a high-level signal to port PPG1_0 of the drive module 10 and a low-level signal to port PPG1_SW1 of the drive loop switch module 20, thereby controlling the drive loop switch port of the drive loop switch module 20 to send a second drive signal to drive the switching transistor 40. The second duration can be within the range of 0.5us ≤ T3 ≤ 25us, and for example, it can be 1us, 2us, 3us, 4us, 5us, 6us, 7us, 8us, 9us, or 10us, without limitation. A duration that is too short is insufficient for the control module 60 to apply control to the drive module 10 or the drive loop switch module 20 and for the switching transistor 40 to change its on / off state; a duration that is too long affects the detection efficiency and the overall detection process. Therefore, selecting a second duration within the range of 0.5us ≤ T3 ≤ 25us is more appropriate.

[0070] Please see Figure 7 Step 02 includes:

[0071] 021: The pulse input port of the control drive module 10 is switched from a low-level signal to a high-level signal with a third duration T2, and the drive circuit switch port of the control drive circuit switch module 20 is switched from a high-level signal to a low-level signal with a third duration T2, so as to control the synchronization detection module 30 to perform the first fault detection on the resonant circuit 100.

[0072] 022: The pulse input port of the control drive module 10 inputs a high-level signal with a fourth duration T4, and the drive circuit switch port of the control drive circuit switch module 20 inputs a low-level signal with a fourth duration T4, so as to control the synchronization detection module 30 to perform the first fault detection on the resonant circuit 100.

[0073] Please combine Figure 1 Steps 021 and 022 can be implemented by the control module 60. The control module 60 can be used to: input a high-level signal of the third duration T2 to the port of the drive module 10 and input a low-level signal of the third duration T2 to the port of the drive circuit switch module 20, so as to control the synchronization detection module 30 to perform the first fault detection on the resonant circuit 100; input a high-level signal of the fourth duration T4 to the port of the drive module 10 and input a low-level signal of the fourth duration T4 to the port of the drive circuit switch module 20, so as to control the synchronization detection module 30 to perform the first fault detection on the resonant circuit 100.

[0074] The specific detection process for the first fault detection during the third duration can be, for example, as follows: Control module 60 can input a level signal to the pulse input port of drive module 10. The pulse input port of drive module 10 can be the PPG1_0 port, and the level signal can be the signal from the PPG1_0 port, which can change from low to high. Control module 60 can also input a level signal to the port of drive circuit switch module 20. The port of drive circuit switch module 20 can be the drive circuit switch port, and the level signal can be the signal from the PPG1_SW1 port, which can change from high to low. The third duration range can be T2 ≥ 5us. Switch transistor 40 is turned off, and the coil inductor does not work; the signal at the PPG1_SW1 port is low, the synchronization detection selection switch is turned on, and the synchronization detection module 30 starts detection, but will not detect the resonant signal. If the synchronization detection module 30 detects the resonant signal, it indicates that the resonant circuit 100 has failed.

[0075] The specific detection process for the first fault detection during the fourth duration can be as follows: the signal at port PPG1_0 remains high, and the signal at port PPG1_SW1 remains low. The fourth duration can be T4 ≥ 5µs. Switch transistor 40 is turned off, and the coil inductor does not work; the signal at port PPG1_SW1 is low, the synchronization detection selection switch is turned on, and the synchronization detection module 30 starts detection, but will not detect the resonant signal. If the synchronization detection module 30 detects the resonant signal, it indicates that the resonant circuit 100 has failed.

[0076] Please see Figure 5 and Figure 8 In some embodiments, steps 04 and 05 include:

[0077] 041: The pulse input port of the control drive module 10 receives a low-level signal with a fifth duration T5 so that the drive module 10 outputs the first drive signal;

[0078] 042: The drive circuit switch port of the control drive circuit switch module 20 is input with a low-level signal of the fifth duration T5 so that the drive circuit switch module 20 outputs the second drive signal;

[0079] 051: The pulse input port of the control drive module 10 switches from inputting a low-level signal to inputting a high-level signal with a duration of six hours (T6).

[0080] 052: The drive circuit switch port of the control drive circuit switch module 20 is input with a low-level signal of duration T6 for the sixth time, so as to control the synchronization detection module 30 to perform a second fault detection on the resonant circuit 100.

[0081] Steps 041, 042, 051, and 052 can be implemented by the control module 60. The control module 60 can be used to: input a low-level signal of the fifth duration T5 to the port of the drive module 10 and input a low-level signal of the fifth duration T5 to the port of the drive circuit switch module 20; input a high-level signal of the sixth duration T6 to the port of the drive module 10 and input a low-level signal of the sixth duration T6 to the port of the drive circuit switch module 20.

[0082] Specifically, the control module 60 inputs a low-level signal to port PPG1_0 of the drive module 10 and a low-level signal to port PPG1_SW1 of the drive loop switch module 20 to control the drive module 20 to issue a first drive signal and the drive loop switch module 30 to issue a second drive signal, while the drive switching transistor 40 is in the on state. The fifth duration can be in the range of 0.5us ≤ T5 ≤ 25us, and the fifth duration can be, for example, 1us, 2us, 3us, 4us, 5us, 6us, 7us, 8us, 9us, or 10us, without limitation. If the duration is too short, it is insufficient for the control module 60 to apply control to the drive module 10 or the drive loop switch module 20 and for the switching transistor 40 to change its on / off state; if the duration is too long, it affects the detection efficiency and the overall detection process. Therefore, choosing a fifth duration within the above-mentioned duration range is more appropriate.

[0083] The second fault detection process can be as follows: the control module 60 can input a level signal to the port of the drive module 10. The port of the drive module 10 can be a pulse input port, and the level signal can be the signal of the PPG1_0 port, which can change from low level to high level; the control module 60 can also input a level signal to the port of the drive loop switch module 20. The port of the drive loop switch module 20 can be a drive loop switch port, and the level signal can be the signal of the PPG1_SW1 port, which can be maintained at a low level. The sixth duration range can be T6 ≥ 5us.

[0084] In the second fault detection, if a resonant signal is detected and the resonant circuit 100 is determined to be fault-free, a control module 60 will drive the switching transistor 40 to synchronize the driving current and the resonant current. This process involves changes in the coil inductor current. Specifically, in the second fault detection, the switching transistor 40 changes from on to off. When the switching transistor 40 is on, the coil inductor charges, and the coil inductor current gradually increases from 0, reaching its maximum when it is off. After the switching transistor 40 is off, the coil inductor charges the resonant capacitor, and the coil inductor current changes from its maximum to 0. Then, the resonant capacitor charges the coil inductor, and the coil inductor current increases in the reverse direction from 0 to its maximum, then decreases back to 0. When the coil inductor current is 0, the capacitor voltage reaches its minimum point. A low-level signal at the PPG1_SW1 port activates the synchronization detection selection switch, and the synchronization detection module 30 starts detection, which can detect the voltage change across the coil inductor, i.e., detect the resonant signal. If a resonant signal is detected, it can be determined that the resonant circuit 100 is fault-free. Finally, the synchronization detection module 30 can also send a synchronization signal to the control module 60. When the resonant capacitor voltage reaches its lowest point, i.e., the resonant current is 0, the control module 60 will turn on the switching transistor 40 to synchronize the phase of the driving current with the resonant current.

[0085] In some embodiments, the duration of the first fault detection and the duration of the second fault detection are greater than or equal to 5 microseconds.

[0086] To ensure detection accuracy and timely detection of the resonant signal, preventing the signal from being missed due to insufficient detection time, the duration of the first and second fault detections can be greater than or equal to 5 microseconds. The durations of the first and second fault detections can be, for example, 6µs, 7µs, 8µs, 9µs, 10µs, 11µs, 12µs, 13µs, 14µs, or 15µs, without any restrictions.

[0087] In some embodiments, the resonant circuit includes multiple driving modules 10 and multiple driving circuit switching modules 20 corresponding to the driving modules 10. The driving module 10 includes a pulse output port, and the driving circuit switching module 20 includes a driving circuit switching port. Each driving circuit switching port drives and controls the corresponding switching transistor 40 to be in an on or off state.

[0088] The control drive module 10 sends a first drive signal or the drive circuit switch module 20 sends a second drive signal to drive the switch transistor 40 into the on state, including: controlling multiple pulse output ports to send a first drive signal or multiple drive circuit switch ports corresponding to the pulse output ports to send a second drive signal to drive the switch transistor 40 into the on state.

[0089] Please combine Figure 2 Specifically, the resonant circuit 100 can consist of multiple drive modules 10 and corresponding drive circuit switch modules 20, with four drive modules 10 and corresponding drive circuit switch modules 20. Each module has a PPG port connected to the control module 60. The first drive module 11 and the second drive module 12 are controlled by the PPG1_0 signal from the same PPG port of the control module, and the third drive module 13 and the fourth drive module 14 are controlled by the PPG1_1 signal from the same PPG port of the control module. The first drive circuit switch module 21 is controlled by the PPG1_SW1 signal of the control module 60; the second drive circuit switch module 22 is controlled by the PPG1_SW2 signal of the control module 60; the third drive circuit switch module 23 is controlled by the PPG2_SW3 signal of the control module 60; and the fourth drive circuit switch module 24 is controlled by the PPG2_SW4 signal of the control module 60. The high and low levels of PPG1_SW1, PPG1_SW2, PPG2_SW3, and PPG2_SW4 can be different to achieve control of different synchronous detection selection switches.

[0090] In this way, multiple pulse output ports can be controlled to send out a first drive signal or multiple drive circuit switch ports corresponding to the pulse output ports can send out a second drive signal to drive the switch transistor to be in the conducting state, so as to drive multiple synchronous detection modules 30 to perform first fault detection on multiple branches of the resonant circuit 100.

[0091] In some embodiments, controlling the drive module 10 to issue a first drive signal and the drive loop switch module 20 to issue a second drive signal, while the drive switch transistor 40 is in an on state, includes: controlling multiple pulse output ports to issue the first drive signal and multiple drive loop switch ports corresponding to the pulse output ports to issue the second drive signal, while the drive switch transistor 40 is in an on state.

[0092] The control module 60 can input low-level signals to multiple drive modules 10. At the same time, the control module 60 can input low-level signals to multiple drive loop switch modules 20. This can control multiple pulse output ports to emit first drive signals and multiple drive loop switch ports corresponding to the pulse output ports to emit second drive signals. Meanwhile, the drive switch transistor 40 is in the on state to drive multiple synchronous detection modules 30 to perform second fault detection on multiple branches of the resonant circuit 100.

[0093] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A resonant circuit, characterized in that, The resonant circuit includes a driving module, a driving circuit switching module, a synchronization detection module, a switching transistor, a resonant heating module, and a control module. The resonant heating module includes a coil inductor and a resonant capacitor. The driving module is connected to the driving circuit switching module. The switching transistor is connected to both the driving circuit switching module and the resonant heating module. The synchronization detection module is connected in parallel with the resonant heating module. The control module is connected to both the driving module and the driving circuit switching module. The control module is used to send control signals; The drive module or the drive circuit switch module is used to send a drive signal according to the control signal to drive the switch transistor to be in the on state or the off state. The synchronization detection module is used to detect the resonant signal generated by the resonant circuit and send a synchronization signal; the control module is also used to determine whether the resonant circuit has failed based on whether the synchronization signal is sent.

2. A fault detection method, applied to the resonant circuit of claim 1, characterized in that, The fault detection method includes: The drive module is controlled to send a first drive signal or the drive circuit switch module is controlled to send a second drive signal. The first drive signal is a signal that drives the switch transistor to be in the conducting state, and the second drive signal is a signal that drives the switch transistor to be in the conducting state. The synchronous detection module is controlled to perform a first fault detection to determine whether the resonant circuit generates a resonant signal. If the synchronization detection module detects the resonant signal, it sends a synchronization signal to determine whether the resonant circuit has failed.

3. The fault detection method according to claim 2, characterized in that, After the synchronization detection module performs a first fault detection to determine whether the resonant circuit generates a resonant signal, the fault detection method further includes: If the synchronization detection module does not detect the resonant signal, then the synchronization detection module does not issue the synchronization signal, and controls the drive module to issue the first drive signal and the drive circuit switch module to issue the second drive signal, driving the switch transistor to be in the on state; The synchronous detection module is controlled to perform a second fault detection to determine whether the resonant circuit generates a resonant signal. If the synchronization detection module does not detect the resonant signal, then the synchronization detection module will not issue the synchronization signal, and it is determined that the resonant circuit has failed.

4. The fault detection method according to claim 3, characterized in that, After the synchronization detection module performs a second fault detection to determine whether the resonant circuit generates a resonant signal, the fault detection method further includes: If the synchronization detection module detects the resonant signal, it sends a synchronization signal to determine that the resonant circuit is fault-free.

5. The fault detection method according to claim 3, characterized in that, The control of the drive module to issue the first drive signal includes: The pulse input port of the drive module is controlled to input a low-level signal of a first duration, and the drive circuit switch port of the drive circuit switch module is controlled to input a high-level signal of a first duration, so that the drive module outputs the first drive signal; The control of the synchronization detection module to perform a first fault detection on whether the resonant circuit generates a resonant signal includes: The pulse input port of the control module is switched from a low-level signal to a high-level signal of a second duration. The drive circuit switch port of the drive circuit switch module is controlled to input a high-level signal of a second duration to control the synchronization detection module to perform a first fault detection on the resonant circuit.

6. The fault detection method according to claim 5, characterized in that, The control of the drive circuit switching module to send the second drive signal includes: The pulse input port of the drive module is controlled to input a high-level signal of a third duration, and the drive circuit switch port of the drive circuit switch module is controlled to input a low-level signal of a third duration, so that the drive circuit switch module outputs the second drive signal. The control of the synchronization detection module to perform a first fault detection on whether the resonant circuit generates a resonant signal includes: The pulse input port of the control module receives a high-level signal of a fourth duration. The drive circuit switch port of the drive circuit switch module is controlled to input a low-level signal of a fourth duration to control the synchronization detection module to perform a first fault detection on the resonant circuit.

7. The fault detection method according to claim 6, characterized in that, The step of controlling the drive module to send a first drive signal and the drive circuit switching module to send a second drive signal, while simultaneously driving the switching transistor to be in the on state, includes: The pulse input port of the drive module is controlled to input a low-level signal of a fifth duration, and the drive circuit switch port of the drive circuit switch module is controlled to input a low-level signal of a fifth duration, so that the drive module outputs a first drive signal and the drive circuit switch module outputs a second drive signal. The second fault detection of whether the resonant circuit generates a resonant signal by controlling the synchronous detection module includes: The pulse input port of the control module is switched from inputting the low-level signal to inputting a high-level signal with a duration of six. The drive circuit switch port of the drive circuit switch module is controlled to input a low-level signal of six durations to control the synchronization detection module to perform a second fault detection on the resonant circuit.

8. The fault detection method according to claim 7, characterized in that, The duration of the first fault detection and the duration of the second fault detection are greater than or equal to 5 microseconds.

9. The fault detection method according to claim 2, characterized in that, The resonant circuit includes multiple driving modules and multiple driving circuit switching modules corresponding to the driving modules. Each driving module includes a pulse output port, and each driving circuit switching module includes a driving circuit switching port. Each driving circuit switching port drives and controls a corresponding switching transistor to be in an on or off state. Controlling the driving module to issue a first driving signal or the driving circuit switching module to issue a second driving signal to drive the switching transistor to be in an on state includes: The multiple pulse output ports are controlled to emit a first drive signal, or the multiple drive circuit switch ports corresponding to the pulse output ports emit a second drive signal to drive the switching transistor to be in the conducting state.

10. The fault detection method according to claim 9, characterized in that, The step of controlling the drive module to send a first drive signal and the drive circuit switching module to send a second drive signal, while simultaneously driving the switching transistor to be in the on state, includes: The system controls multiple pulse output ports to emit a first drive signal and multiple drive circuit switch ports corresponding to the pulse output ports to emit a second drive signal, thereby driving the switch transistor to be in the on state.

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